Improvement in rotary valves



wimssns:

D. W. JONES. Rotary Valves.

Patented Feb. 26, 1878.

ATTORNEYS.

UNITED STATES PATENT OFFICE.

DAVID W. JONES, OF POOAHONTAS, ARKANSAS.

IMPROVEMENT IN ROTARY VALVES.

Specification forming part of Letters Patent No. 200,728, dated February 26, 1878; application filed December 8, 1877.

To all whom it may concern:

Be it known that I, DAVID W. JONES, of Pocahontas, in the county of Randolph and State of Arkansas, have invented a new and Improved Steam-Engine Valve, of which the following is a specification:

Figure 1 is a horizontal section taken on line .90 w in Fig. 2. Fig. 2 is a vertical trans i erse section of the valve, taken on line y y in Similar letters of reference indicate corresponding parts.

My invention relates to the class of enginevalves known as cylinder or plug valves; and it consists in an arrangement of steampassages in the valve, and ports and passages in the valve-casing, by means of which the pressure on the valve is equalized or counterbalanced, so as to relieve it from friction.

In the drawing, A is the valve-casing, having the passages a, which communicate with the ends of the cylinder, and intersect the tapering valve-chamber b diametrically. There is a curved passage, 0, on each side of the valve-chamber, which communicates with it and with the passage at. There are also passages d e, communicating with the valve-chamber, and arranged diametrically opposite in relation to the valve and at right angles to the passage a.

The valve B consists in a hollow slightlytapered plug, having the spindle f, which extends through a stuffing-box, g, at the side of the valve-casing, and has attached to it the lever h, which is connected with the valve-operating eccentric.

In the lower side of the valve there are two cavities, i, which are of suflicient width to bring the supply-passage 6 into communication with the passage 0 on either side of the valve as it is oscillated.

By means of these cavities and the arrangement of the passages c a steam is admitted alternately to opposite ends of the cylinder. The valve is provided with openings k on opposite sides, which communicate with the chamber in the valve, and are arranged in relation to the cavities i in such a manner that when steam is admitted to one end of the cylinder through the supply-port e, cavity i, and passages c a, the steam escapes from the opposite end of the cylinder through the passage on and opening it to the chamber 1 in the valve, whence it passes through the wide opening 112, which is equally distant from the opening is to the exhaust -port at in the valve-casin g. The valve and valve-casin g are symmetrical in the arrangement of their ports and passages.

By means of my improvement the valve is, to a great extent, balanced, and the disadvantages of steam-room in the valve chest or casing are avoided.

Having thus described my invention, I claim as new and desire to secure by Letters Patcut-- The combination of the rotary valve B, having the central chamber 1, the openings k m, communicating with said chamber and the surface cavities i, with the casing A, having the connected passages a c, the supply-port e, and exhaust-port d, all constructed and relatively arranged as herein shown, to operate in the manner set forth.

DAVID WILLIAM JONES.

Witnesses:

C. G. ELDER, ABRAM WEAVER. 

